The symbol suggests it's the adaptive m sport suspension button, which I once saw on an M135i (can't remember if it was above or below the eco pro, comfort buttons etc), it's just strange it's in the exact same position as the one on my car for the front sensors...

Just referred to the UK's 1 series brochure and it's the DTC button - On the dash you have the door lock and hazards on the F20/F21 - got confused because I currently drive an e90 which also has the DTC on the dash. You're right, if you select sport+ it deactivates the DTC.

The OP is asking about the one with the yellow ring, and I do believe this will activate the front parking sensors. I think you’re talking about the button on the top (the one with the pink ring around it in post #3).

Quote:

Originally Posted by ACE-TaJ

You're right, if you select sport+ it deactivates the DTC.

No, when you select Sport+, you turn on DTC (dynamic traction control). Under normal circumstances this is deactivated, but DSC (dynamic stability control) is active. DTC is a mode that allows for more wheel slippage before DSC kicks in.

The yellow button is fitted if you have front and rear PDC. Pushing this button turns on and off both front and rear parking sensors.
When selecting reverse both front and rear PDC are made active, in a manual car these do not cancel when you take the gearbox out of reverse. You can press the PDC button to cancel the sensors in this situation,

The DSC button allow you to select three options. DSC On, DTC - Traction, or DSC Off (ABD-Sport On)

Drive control function switches between Eco Pro, Comfort, Sport and in some models Sport +. Throttle response, steering feel and susension are changed depending on what options are fitted to the vehicle.